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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f04a6945487709d8c7c40f5c6f921ed6a963ce8abc6dc8c0852da74d3c076bb' 
  AND token = 'q3DgqELccEcUZkgg5Dvs66tRBJ+bp88K+zZ/6lwk16E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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