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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ed33c2222ab9952a3d7aef522755941af36e56ad936116dba831cfe92a2b0c' 
  AND token = 'czA1Sk/o7uCd9hBwwnjnLjVns/RZ9+jFwQErwjSzMTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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