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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c99d04b2902a4c66fd9fd6c950382276ac16a089369a3cf4a722ca36f33eb54' 
  AND token = 'wbGiif2nMEKegvvZO6aimRmxo4h4AmcG6RTh7e1Ir8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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