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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d01cd955142009c898be9d4d64c0ab7ea12d42ef7d24a5bba3083b9759b6e02' 
  AND token = 'xhOnYjp1gnD4yXebea1u5RssYY1iwLnqT6XO0vtnCeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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