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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bd3ae2b1568caf3ea2a5e9230bb7e47ccba1aa5bff6a18132a5b063b3af023' 
  AND token = '2eHwjqFtYdLAq3D1rKxXzjUgZVpvi4QGNpu7ZJ13FMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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