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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1fabb06aaf7781efaa72372ed75b7314e7811a1bb46917af535fd5b35c4a27' 
  AND token = 'Y35umhHOaPW8Qx0IdklK+pYi5WTRG0N45IudYlMuNoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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