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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99306599c960b8915fecd4c6b41e4df65df16fe6894aba42429d0d2f988f876c' 
  AND token = 'qMK4BEpwR940m29Nn/OJZgm7uWiC3h6GDws1qPn3ZmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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