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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9ad86bab76cf1b67951e62d54f7aceb9565a3928cfe03a3c501fc0f444a907' 
  AND token = '87HAwPyU6Zi9IaGlI3D5DZF7fuTYXE6EsrlcxdwkyHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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