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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0965ea684c1ccf368c5b34ad578163218365ee127bcae4cf1b49e6ba81d6705c' 
  AND token = 'wd/VeDVifElFNGunXfpX8O95Uu87FdVOmq3X0SZwves=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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