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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e39d4b18a744a0de567b35743346b07977331a138e5446e94b31a8d05ddd2f' 
  AND token = 'G8mfQ6aOrjlBKFI/Ii7kUOQ0QjOO41M4cdjnc+IfbW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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