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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4665870f10a607d6b152a863913638128b114dc3b41f17a9a3c1306c6137973f' 
  AND token = 'pKQ44T8cf9IFeZL4tYDb++nkhGCQE64Q+qS5z4HHYV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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