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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc9867ed945b7a88eb0f1e0c3a33abd0f8180932d27c169dbc99ce16947e4c4' 
  AND token = '+9M2w95AjULHu5ODyLLtO9YqmJc4f4wweUpMeAyQRVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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