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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55842ddfa26bfd5e87434c6f044b9f888ba7adfca7b51a62fa23b0057782997' 
  AND token = 'CMRgPHRdcZ+Qp7kn942g4FDfcD8iGvO2sXUbJn8rQX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}