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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab25f9ddf1a899051c6cd6b4f1ec34173c732fc80ecf44bb738c361c736bcb0' 
  AND token = 'WxnSOHCUKmTS9Urmb1WMHT+rh+MH4OBt4q03fkY4cik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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