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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08919d47e7d338921e2064a0b7c422a9cc8d6f20f65292a55cda3ccc98d0ef33' 
  AND token = 'dyo+y0kZXAB0P3VE4b95Iz7xNGnKYgdsFnUdaGVdll0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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