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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9508117b62719d0e125e98dafe8fbbcf8b8425a23990570cb9d5acb16cf832c' 
  AND token = 'IkztZdms2iYXYquaZdFcS5qay2D9Jsq52xyh6NbH8eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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