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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b13e30b2c5d1fcac0e8fea37bc3ac69eb31298f64041129b2131fbbbb6f6e69' 
  AND token = 'UaUQsi/UVfr3jONS44ah/stO8zu+XZfY+Vhn7cP5HWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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