SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc3c7e8547c14fc8e1f881f90735299928c71e5c0b3cb036b3c8e6ddddcd47b' 
  AND token = '6PG7HuOOPOId9LmgZ6uaY8Ur96DC7hJTqzYAsWX+D/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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