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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2184822057b2f285d61d6238e6fdc07139f4fb2db7dd88ecb7e45cf1ae8e4213' 
  AND token = 'n7nZF0ffmmlqiXjZ/ISApFQ0qWz/krI7rDfHEeI/v8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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