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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6043006adbf3c32264f9e489d7359278b3aa44d30552a1a5d2746c45d13dce' 
  AND token = 'JpcAaspRaPC7xY/vSlihyDkK1goW/LVx0SJ3r3PnYxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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