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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc3ed6896c45f9fcf772f96a5d0809f3f94078ecf033594c79a50bccf0de0ee' 
  AND token = 'erYSqBkjoiN+Hl2hLqvfkgatxdO5W6cOAkbUST2ZuQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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