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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb7b86ed12d4c06de067d31368bdebd3c36e91fd6891dff609284af81804d3d' 
  AND token = '6gGnJvUVjP8zlQoQS80odFJ/j0ElsIgGgGCS0kz8yo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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