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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af56de39732aa95d8bc955e2cc2f21fbde8b49c090bb1075a09117de40599ecd' 
  AND token = '6Z+SwVtvEERaOGToG6Qc8Ay7uDRy/val+mo42VSOkYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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