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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013661c6fffd6860ca21d3f0d4292cff55bea45aab6cd844e1ba92a4cfae30f3' 
  AND token = 'tbAfFl3zInivWq1eXotORWpGDQU+B4ABG791bgMq5Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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