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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7625c52a41c9cf26bbe36a4aa8875cc80bcdbc586b6cc5c025d8ebf0493be0' 
  AND token = 'xQJVtP4F5nGDxEBA4XEEuVmiQoijtCEZfoIkr+f28kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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