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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2775a863b76bb1814349d88d0b1ebada6dd2398ef17213aec72cad9b00465ae5' 
  AND token = 'OgjsO3wqSbjC7XtVcFUKap4TCJeT2N8sBUKoPN9OYN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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