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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f1f2f89dee2781320a897fff0251dfa962fe7f06234bb477b30aa720f54fc7' 
  AND token = 'k8jjEKgqU68hzsITq69ldDZdWd9EIQ07NOYdaTWRHuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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