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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c20160a9cd88cc323823401809a376bd93ec490d76df2e1fe4b312e1873241' 
  AND token = 'OprUWqM7HQgnNq5SSFm6OS/45ivVNg0Ral+hQ4i+ljA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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