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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '253d9fe7eae4fdd973fee01b8530c474a8802ed3bfc5f2f202dfd0f3080ef47f' 
  AND token = 'CigrZwuJqzse8fY+EwEY2s8s1mVWrdMehv0d+cznY34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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