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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f16c4a975d235c5e99804022aad1d2230ab02ed7e2a980a04ad4d029f216dfa' 
  AND token = 'x3spYNnWwlFxUpHmf9hCRbJwkL+4M99CDug5wGDWuus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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