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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf26316bc71b3c8a734e749262b7c9a175259d2e85fc8ebc98ff270b9b66de5d' 
  AND token = 'm3yCF3juOY5LYas9V0V9egCoUvgc0XZ0s2q6sVrCATk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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