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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a899e4d49afd57e0eea4e5a043ad2127119d4fdedd2693286e433e43910be1' 
  AND token = 'GwzR3fxCEjGVmCuSlFsUItJo4f2UUsk2RAba98EUn8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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