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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7cf31c8bfd63cef0c5e6cffd0ce98432ae21fb8b86f60128296a4b269e64e77' 
  AND token = 'NfIFRm9uCSq109wlShiLm4LcIeQtbDguxJGfVj1WhPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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