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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5695a07d8fe3ab8dfd2c6c77035751d000d5eea21ec430edd50ff2f43f8ce9fe' 
  AND token = 'uiwlQeavsC4VL0Pe5rZ2uuGQ0fmdIGNl/6dKiKP+oXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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