Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940c34ed6820c38a999c6b4cba5236c4e3eaffb94c20750fd87b418653400ee0' 
  AND token = '2zA0s1i5ogVj+EMIFdD6itk8WOZ9A59DH/JjxwXIQyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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