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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf0d6edf0ae34fd25a5ae7f536aeec2b64784a8191a9f783ada18545cb402a0' 
  AND token = 'cy6wMc7C5e2MqMdjpbhn9vpUTXA1NJI+9LqQ1WLcD+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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