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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91845e17ee094ca7a2bb39843213ff12358b5201041447d558738663cec2d816' 
  AND token = '2FzMoBVf53+OjOg/5ejsWUUxsYnLlpPN2we3eo6ivEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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