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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced3702ef1e56fe6fba3c4870d4f515a3d7f887f5436071ea0cbeb7f15a24cff' 
  AND token = 'rG/cxc/fb9IYQC/F4FUqYNmTu7dZ91P093sqWst56tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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