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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b242ce8466b27ca57e233e3e98570b28d5389a913dc21ddf5e938daf41c71068' 
  AND token = 'yyFQpwd0HrMZvttnSW7IZ1TBk8iwOXt7N/6NaItJG/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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