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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a6ed798ee0c2f9f120484295a5bca0c2663280336c7cbbcba05ecc58282984' 
  AND token = 'iRGaAPU4mo0Engapudcf8N7yK0HQ/imEnw6jybhOj8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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