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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be87aeeec815068fa95ed8b3597385fb4a6d31d6e17d91d8ec45833da5c590b9' 
  AND token = '324sA30lhq0uvTq4lNL8VlKF4k4xGxnbC/2yEJss0Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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