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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248b772ba626cdc75f6e1409babb420644e82a8ef9095208451e400100dbedbd' 
  AND token = '9uc4aWYm5fBVI34TnGyuGJBvy0gg5yp+EsnaN1Ciwns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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