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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f3ca5046439b77879e79e73acbc9ec97ddabcbb59114281b6865ceace6ce4a' 
  AND token = 'WwcMZVoKQ724od7Ygo2xT7Y07cq1y/R1IfFE6qnnGDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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