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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed2d81978392cc85980d3ad565efe0abec8aed6ec280befeada0c4ebc5b4719' 
  AND token = 'na5O2nD+JZrgUZ7w+BxMoXEi5+EETW1b+kscPHJhb1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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