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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09309465b332435c42131a8c8654402f9d60ef90afec794c0e6326de191fdf52' 
  AND token = 'zOKOe5nwQ3nyvOja3pPBpMGX/EUl4yO1m7zeF3ACq/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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