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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563461955bff94e109c6e84d6fac196a7eee87eecf79285ff95832a469094663' 
  AND token = 'dR6Zq6vUGZPl69g9Gv+Pq1V7c6WAdjFthpuQYVfWQcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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