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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52affa33b34ba14265f7ae6b05df012c5e7d6f9ca04acd188659a72c6b91493f' 
  AND token = 'lpgtnNy4dCaezoPaxEcByqY4MrmbKLeMZOeRqztyucE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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