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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39518389d043f5a4f29e6e43327a9c280f10b76189458c945e34f638886bd98a' 
  AND token = '5+zY3rMfnlPs2Y6dmI3OKwlARBPfd6bnN9yBFURMshY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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