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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5d073ebb406d7c97c59cd70ec87daf98d987bd5fe0a72270b69d7af01bbfea' 
  AND token = 'mbM2EH4SlZQl4xlycPgqAm5Hp2hjYlGr5pWsgx12Cbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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