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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2af6e1e0654b82abf2bef466df5ec266478fba08076e07ffff165b694238ab' 
  AND token = 'nfo2eHpQmU1uUwAGjiRvF2//fB+sTpUSXTJB9F89tA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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