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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fefca2d1df81cd30333b3a7a58eaa37d9d9fc450f3c6b07c744aa0aca3c8d5e6' 
  AND token = 'YzmyPTMoCY/19uQXEbqjBeI8svXaERh5MZmolSprWI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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