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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b099cd22412c53627ed40f6b07ee0336b6cba8f6d151196cb3ef7983548265' 
  AND token = 'Ub6ToeY0lISmOtiIeWu4V8SJT1aMzwRqJAciYheHrbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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