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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f25b32185787463eab53a59f5202425900645fa1ae20771646ba2fde005f59d' 
  AND token = 'HYXltyAYFk3l2uBovfonAulAxkQeq4vEgN86Sd+FbpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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