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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64be1fb67be840a8e5ef663c8d9bf4ffb9f511133e1a244c59e1634b45ca1a9' 
  AND token = 'XJV8jn7MGpyk3WbqOH5fZ1TZ89dhQrEJJ9MRWNs1k/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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