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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb9d22edd14e97d546f058a84ea84adad98993faf3292c738774075d5f0e0e0' 
  AND token = 'zmUcW+uBmMfrCNiemg6LD/2Cf4S6SJf68DZz0Ct9eGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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