SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bede97761b4984b7bd89e9081f1c623b3bd75016005afa95934ef34d27d734' 
  AND token = 'CLKQirFN1nd8+5WrDKSzljJG4qHC+Dzx5kfQ1lt9vjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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