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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e91cb772cb3e3bd7253250720c78858b381ddab08bd91a4b41abb7910d107e' 
  AND token = 'gtHHCw7wMJoT04lNQ65PsFlVTmiG504d3BqE+1R4A9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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