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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0f04d5a21dbd66af3213671d6ef5026a1e0b13aa59c300ea2ef58108079deb' 
  AND token = 'vpRvm1y2vYTzI0tpgShcxt31OgFhyzWLIyf7KheaOTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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