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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe5341475d99595937d3a71c2f731579b071ef1e5529bf8894bcd4561e24aab' 
  AND token = '9vABkONtkeiTWxku0fEz4eb+YOnEYV5/9j1GYZYmYTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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