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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd28f7b86497d943e34a34bfd8a0c11378136975c77b509a140300f75740e963' 
  AND token = 'sWo8a7Bkel49svxTIi+ScKe5OgoQGNej2Rpf6Sx7MBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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