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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef652eea4ee3ba113c56ffbcf09404e3e4dd7deb6c8a49a0fa38cc5606981a34' 
  AND token = 'Rc8ClrKIs67EJj8hdmneISvkxKFI3/3RaGI8dH16Y30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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