SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05464e6eef7196b1e0eedfae3fa845b44d78f5edafe83b616bc2c0dcb27834c4' 
  AND token = 'mG4rGnxCYEj8pze9ruwX/3/Kqlmqd7hXFjDZWxPTPgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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