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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49803bc574c8ed093421f2f451d0636e94efd47430ef4f28cd8a3fbab87e580f' 
  AND token = 'J3j4w1IaHu6Us+FVitTLjMqSe44ee6P+G4WQnH4/JpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}