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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2eef97637ce8f95efc92722582470f23c51adb3c3938778d0bffbdef0b2c37' 
  AND token = 'N59JxOHy4hvWtIpNPztf/1gNQPfxBzD3fg2/ycOxK0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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