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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe5cc24ab8f7890e0e1e6a6eba797b3165813374a870616be3c08d82473b612' 
  AND token = 'Xdt7yaZpMBrc5NLKic4niydYSVkZDqasFQeywid9veA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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