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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aacbd46ee0d1e8364a1510beedbeb80a8ceb9520b6e3e49cbcf68fb483a827bb' 
  AND token = 'qi9Y0HO34V1zisjfqfaRq+4vyndl20b0DchZpeprY6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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