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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf74cf8800dfb8af447c43153f4f52ca8661bba47a09a7e2fc81c746c65a5069' 
  AND token = 'fblq/3JlNuQcWJm1RvlGQ1KHvAbwdgnCVqWxc1xLyl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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