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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c683e4355bfddb0d1746f4926e2b3255186142827f194478779dd698ca1a78' 
  AND token = 'gOWekpQOdkMHLQVxe/MLXlTNW7N+kw07rX0y6uUar3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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