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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994b01b58acfb44709a8ee85380ee5f72ddf67dc927a4a567c082f5281f8c953' 
  AND token = 'fxLxd77yQldwZ58tO932AFaGmrT0qA0B/xoJpXDwujg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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