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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbbe662ae1861caea29c532b88573ef59ccb1197fa2cce4f37e3903ae1b52ff' 
  AND token = 'NVWNWMjfo9b7I5JGhzG2gYPzAyrIDX1gwA8olUiEtr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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