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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a775f1f6fc4ba3683ca29f708c7f70c593e42d8da2cbedf7cd4d861af28a8c' 
  AND token = 'wnKUR/1OaP+RbRtut23RCELxkVcm70xHQv93OhwyGf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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