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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75e80636b079a84c772e488a5af0ab9be38f3eaf1362826a0ce650ff039eecf' 
  AND token = '82kFL0Tg0dPJCTWO23coVplo/ccf+II2NnJPfqZLb1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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