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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0841a5422d8b24e5861c74712575d1ae8c4d8c82eb30c21f4807009bf6a3bd1d' 
  AND token = '48hobP+ucPvS9vsMqfAAgCS6gdoiSbaFC5ybVWdB/KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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