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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ad6a6a613246182b22987d4929e7258ed0f60c59074eac730605d3e296c4d4' 
  AND token = 'cmVrD6rUDvVFREN75vdYgOkPPchd+nXFpMoU6COh7BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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