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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0705b00f50dda76f319e69f61a0ba0c5452073c63dee7daceda917922af5ab' 
  AND token = 'NDW/pJGpUnZr1E2ch+z5ULSlW+RYgwSO9q093d1XMTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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