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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e95b4187c452cb649c1e351c6dab460a6fff45d6b14d8e93192518bd37c4f4' 
  AND token = 'vw72EycThTEIBwEep1R7y+cPoJflxI/w/AHwkqo+fZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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