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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56b713bd73bab7df1b6d4e050705584410c4754c2a9f853b0af463e46441412' 
  AND token = 'XUaV0eh0ivZgid1WDHwPxTrmtkzs9zRgaNh3Jae09k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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