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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14b96e5d907386449f3da22318240e4ddc146bef5c8cced792aa76a9dd52dee' 
  AND token = '7Um8KUEdvHZ+oSwhparldrS+1WbiZ/anQ1PYTsRUKDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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