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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b71c2d0bb545d5710f297ea877a97e6ab5a5a0cf1e854ff761978c5c7238c50' 
  AND token = '5uAXD9cquQ4AwJhWejplzoP9fLYszDl/EpnaPuourKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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