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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8913cac1f35cb1b4badf38fec1cd1363c3e2e1dc6c883d420ba8193b74f199ea' 
  AND token = '/DUxzpzIjuM4lYlxvrAMt885xvX1GuwxiPuTKDa/+fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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