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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315d690eadb160fc6138fabf549840f70631d3bc9ae672f0c02aeb0220acb8d0' 
  AND token = 'bfDn01ui92EizDzdCocBfjktmPLsx+YOdaNAaZMBbXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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