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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3faeb65dd92881bef7381f1b3ff5b073c97c116c6bddecf4c31b12b00fb7618f' 
  AND token = 'FgszHYkmhcjsutR7Vdd6+20pGD5uDMp0X2wVVn8F+K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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