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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebec3af3a3268a2afcc98e443b62f7a2a2c686b80d74e882f54e593be4006747' 
  AND token = 'Wuayj2AOsdSiVj+d6RGHt7ecdhYnRQ789vE9zRN1O9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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