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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f211fa8e1a3d381fcaeeab1083d21bc5d99c6f00f38d88a30d24f5dc02c2d07' 
  AND token = 'nNm0MKnzbt24EUpijqBjkruwj3iKMmsgJPneSBnsLPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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