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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcdaa771c69113e0621c39d03479f905c2a15501a10dc56ec344e6ca0c88e642' 
  AND token = 'KXLsZso96JVkW24CKnm1HeMHSTqRqIesEM0qP/mv52c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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