Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97b007144a6807514e15721d18cae56ec58711a39f76f3bf39d6c42f75760e7' 
  AND token = 'K5MPKE8bDCnZ8EpLZJZ5/lKR5gWnYXKN8P6a+M0Wtig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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