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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29299bd8ec11c6e43225f63aab4d54d5a2c7ea96515483b7807c5df384e7b99f' 
  AND token = '24OR3O5ElRZuanWnmd1NwyEHCZeXQ2eNaCJBajBF7jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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