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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc4752f53d56fbe2e82a96d88c03dd06af890f0b21da943210b87a61b24c5d2' 
  AND token = 'GjzNEhOT9C6J2IX2hXDe1IODERkUhRMSMekU/Y/BtCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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