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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ef7056615e8509c96c2daed768a22a4037ae6048e26d7f02c0d67e27693e27' 
  AND token = '8SkDhp4m6LPmj5Ykedb6uNNL4p3GOZT0Aohf22b2s5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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