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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd67b51607c2333bb00d44504f7581faee237f6cc0c39789a16518bf680a8559' 
  AND token = 'pixMQF3tpw66a96jjyivs9oF6uXkJ5sdAyVgGTGTjek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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