SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9883831f8563a552d3c672c9dcaa5a86490f2424e7453161ccf598275127a37e' 
  AND token = '4YVEEJJcZFd0WhvKP9R2cACj/1yoDf3Qwg6B4T2BW5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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