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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af48f1c2184160da3cde143082cf93e2fe5ad3b3df683fb0856a2f23be95baf8' 
  AND token = 'ukna6bjzNWUv55KJnvuPxpPplA6Aqi7mMSjEFnASsVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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