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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438c7ca1773ee34b9a97cd84e429b64a38281aad4f81e6229d269fffb88cc9ac' 
  AND token = 'vyCJERfrqjVIJa5h9DDrG3QDrIggIe0ScvVOeVyoKB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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